Weft pull and release device for weaving looms having no shuttles



Apnl 29, 1969 M. PERACCA E AL 3,441,061

WEFT PULL AND RELEASE DEVICE FOR WEAVING LOOMS HAVING NO SHUTTLES FiledJune 8, 1967 m i\. N .4

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T 'vm 4 l INVENTQRS Manh'o PERACCA Guerrino CICUTTA W v 20% ATTORNEYSUnited States Patent Office 3,441,061 Patented Apr. 29, 1969 3,441,061WEFT PULL AND RELEASE DEVICE FOR WEAV- ING LOOMS HAVING N SHUTTLESManlio Peracca, Muggia-Trieste, and Guerrino Cicutta, Gorizia, Italy,assignors to Nuova San Giorgio S.p.A. Filed June 8, 1967, Ser. No.644,564 Claims priority, application Italy, June 10, 1966, 18,876/ 66Int. Cl. D03d 47/16 US. Cl. 139-122 2 Claims ABSTRACT OF THE DISCLOSUREA weft pull and release device for shuttleless looms comprisingad-justably spaced upper and lower stationary guide elements at one sideof the loom and a pair of weft gripping and releasing blades, one rigidand the other resilient, reciprocable through the restricted spacebetween the guide elements to grip, pull and release the weft.

The invention relates to a novel weft pulling and releasing device forshuttleless looms in which a reciprocating weft gripper and releaser isactuated from one side of the loom to move into and out of the shed ofwarp threads to pull the weft thread into the shed and release it duringeach reciprocation of the gripper. The invention will now be describedmore in detail with reference to the drawing wherein:

FIGURE 1 is a side view of the reciprocating gripper with the guideelements shown in cross section;

FIGURE 2 is a plan view of the gripper;

FIGURE 3 is a transverse section through the gripper during its passagethrough the guide elements; and

FIGURE 4 is a fragmentary side view of the gripper during its passagethrough the guide elements to release the weft.

The gripper comprises a body 1 to one side of which an elongated plate1' is secured to serve as a needle for entering the shed of warp threadsand clearing the passageway for the gripper blades comprising a lowerrigid blade 2 and an upper resilient blade 3 whose rear ends aresuperimposed and secured by screws 13 to the body 1. The front end ofthe rigid blade 2 is provided with a terminal hook 5 which is normallyengaged on its lower side at 4 by the free end of the resilient blade togrip the weft thread and pull it into the shed of warp threads. Thelower blade 2 is preferably L-shaped throughout the greater portion ofits length to provide it with a vertical flange 2 along one edge forrigidity.

To render the upper blade 3 slightly resilient it can be tapered to areduced thickness near its rear end in the region 8, and immediately infront of this tapered portion it is bent upwardly to provide a hump tobe engaged by a stationary member during reciprocation of the device todisengage the free end of blade 3 from the lower side of the hook torelease the weft thread at the outer end of the reciprocatory movement.

To exert the necessary pressure on the upper blade for this purpose, arestricted guideway is provided between stationary members 9 and 10 atthe side of the loom opposite the side where the spool of weft thread islocated. The distance between the members 9 and 10 is accuratelyadjustable by means of an adjusting screw 12 and clamping screws 12 sothat at the outer end of the reciprocatory movement the upper guidemember 9 will be encountered by the hump 7 with sufficient force todisengage the free end of the resilient member 3 from the hook 5sufficiently to release the weft thread which has been clamped betweenthe ends of the two blades, the operation being similar to the operationof the device shown in US. Patent 3,312,252.

What is claimed is:

1. A weft inserting device for a shuttleless loom, said devicecomprising an elongated body (1) adapted to be reciprocatedlongitudinally into and out of a shed of warp threads, a rigid lowerblade (2) having its rear end secured to the body (1) in alignmenttherewith and equipped with a rearwardly and upwardly projecting hook(5) at its front end adapted to catch a weft thread, a resilient upperblade (3) having its rear end secured on top of the rearend of the lowerblade and with its front end normally bearing against the lower side (4)of the hook but adapted to retain a weft thread in position betweenitself and the hook, and a pair of stationary guide elements (9, 10)positioned respectively above and below the path of movement of the twoblades, the lower guide element (10) remaining normally in engagementwith the lower surface of the rigid blade (2) while the upper guideelement is in position to engage the upper surface of the resilientblade (3) to disengage the latter from the hook so as to release theweft thread near the end of the reciprocatory movement.

2. The device of claim 1 in which the resilient blade (3) is rigidthroughout the greater portion of its length but tapers at (7) into anupwardly humped flexible portion (8) in position to engage the guideelement (9) near the end of the reciprocation.

References Cited UNITED STATES PATENTS 2,960,118 11/1960 Ancet et a1.

3,312,252 4/1967 Dewas.

FOREIGN PATENTS 1,391,346 1/1965 France.

HENRY S. JAUDON, Primary Examiner.

